Keep the massive sunroof open the entire journey despite the added wind resistance.

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Reduce wind resistance and you can reduce fuel consumption by several percentage points.

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Montgomery lobbied Scott designers for a new line of bikes targeted at triathletes. (These bikes are more aerodynamic--with tear-shaped tubes instead of round ones--because, unlike cycling racers, triathletes are prohibited from drafting, or riding single file to beat wind resistance.) The market is tiny, but triathletes are visible and voluble.

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Unfortunately, because of the nature of air circulation, any downward-pointing force created aerodynamically generates a backward-pointing resistance in the process just as an increase in the lift of an aircraft wing as the flaps are lowered for take-off or landing creates more drag in the process, forcing the pilot to open the engine throttles to overcome the extra wind resistance.

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But with resistance to wind subsidies growing, backers of marine energy now have their work cut out to prove that such largesse is justified.

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Mr Haldane uses the analogy of dogs, such as border collies, which are very reliable catchers of Frisbees without being aware of the complex calculations (wind speed, air resistance, etc) that might be involved.

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